[327] | 1 | ; Project name : BIOS Drive Information Tool |
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| 2 | ; Description : Functions to read information from BIOS. |
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| 3 | |
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[376] | 4 | ; |
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[526] | 5 | ; XTIDE Universal BIOS and Associated Tools |
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| 6 | ; Copyright (C) 2009-2010 by Tomi Tilli, 2011-2013 by XTIDE Universal BIOS Team. |
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[376] | 7 | ; |
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| 8 | ; This program is free software; you can redistribute it and/or modify |
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| 9 | ; it under the terms of the GNU General Public License as published by |
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| 10 | ; the Free Software Foundation; either version 2 of the License, or |
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| 11 | ; (at your option) any later version. |
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[526] | 12 | ; |
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[376] | 13 | ; This program is distributed in the hope that it will be useful, |
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| 14 | ; but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 15 | ; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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[526] | 16 | ; GNU General Public License for more details. |
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[376] | 17 | ; Visit http://www.gnu.org/licenses/old-licenses/gpl-2.0.html |
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| 18 | ; |
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[327] | 19 | |
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| 20 | ; Section containing code |
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| 21 | SECTION .text |
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| 22 | |
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| 23 | ;--------------------------------------------------------------------- |
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| 24 | ; Bios_GetNumberOfHardDrivesToDX |
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| 25 | ; Parameters: |
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| 26 | ; Nothing |
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| 27 | ; Returns: (if no errors) |
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| 28 | ; DX: Number of hard drives in system |
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| 29 | ; CF: Set if no hard drives found |
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| 30 | ; Corrupts registers: |
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| 31 | ; AX, BX, CX |
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| 32 | ;-------------------------------------------------------------------- |
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| 33 | Bios_GetNumberOfHardDrivesToDX: |
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| 34 | mov dl, 80h ; First hard drive |
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| 35 | mov ah, GET_DRIVE_PARAMETERS |
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| 36 | int BIOS_DISK_INTERRUPT_13h |
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| 37 | mov dh, 0 ; Preserve CF |
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| 38 | ret |
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| 39 | |
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| 40 | |
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| 41 | ;--------------------------------------------------------------------- |
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| 42 | ; Bios_ReadOldInt13hParametersFromDriveDL |
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| 43 | ; Parameters: |
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| 44 | ; DL: BIOS drive number |
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| 45 | ; Returns: (if no errors) |
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| 46 | ; BL: Drive Type (for floppies only) |
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| 47 | ; AX: Sectors per track (1...63) |
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| 48 | ; DX: Number of heads (1...255) |
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| 49 | ; CX: Number of cylinders (1...1024) |
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| 50 | ; CF: Cleared = no errors |
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| 51 | ; Set = BIOS error code stored in AH |
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| 52 | ; Corrupts registers: |
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| 53 | ; Nothing |
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| 54 | ;-------------------------------------------------------------------- |
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| 55 | Bios_ReadOldInt13hParametersFromDriveDL: |
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| 56 | mov ah, GET_DRIVE_PARAMETERS |
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| 57 | int BIOS_DISK_INTERRUPT_13h |
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| 58 | jc SHORT ReturnWithBiosErrorCodeInAH |
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| 59 | ; Fall to ExtractCHSfromOldInt13hDriveParameters |
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| 60 | |
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| 61 | ;--------------------------------------------------------------------- |
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| 62 | ; ExtractCHSfromOldInt13hDriveParameters |
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| 63 | ; Parameters: |
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| 64 | ; CH: Maximum cylinder number, bits 7...0 |
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| 65 | ; CL: Bits 7...6: Maximum cylinder number, bits 9 and 8 |
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| 66 | ; Bits 5...0: Maximum sector number (1...63) |
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| 67 | ; DH: Maximum head number (0...254) |
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| 68 | ; Returns: |
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| 69 | ; BL: Drive Type (for floppies only) |
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| 70 | ; AX: Sectors per track (1...63) |
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| 71 | ; DX: Number of heads (1...255) |
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| 72 | ; CX: Number of cylinders (1...1024) |
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| 73 | ; CF: Cleared |
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| 74 | ; Corrupts registers: |
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| 75 | ; Nothing |
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| 76 | ;-------------------------------------------------------------------- |
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| 77 | ExtractCHSfromOldInt13hDriveParameters: |
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| 78 | mov al, cl ; Copy sector number... |
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| 79 | and ax, BYTE 3Fh ; ...and limit to 1...63 |
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| 80 | sub cl, al ; Remove from max cylinder high |
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| 81 | eROL_IM cl, 2 ; High bits to beginning |
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| 82 | eMOVZX dx, dh ; Copy Max head to DX |
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| 83 | xchg cl, ch ; Max cylinder now in CX |
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| 84 | inc cx ; Max cylinder to number of cylinders |
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| 85 | inc dx ; Max head to number of heads |
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| 86 | clc ; No errors |
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| 87 | ret |
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| 88 | |
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| 89 | |
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| 90 | ;--------------------------------------------------------------------- |
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| 91 | ; Bios_ReadOldInt13hCapacityFromDriveDL |
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| 92 | ; Parameters: |
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| 93 | ; DL: BIOS drive number |
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| 94 | ; Returns: (if no errors) |
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| 95 | ; CX:DX: Total number of sectors |
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| 96 | ; AH: BIOS Error code |
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| 97 | ; CF: Cleared = no errors |
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| 98 | ; Set = BIOS error code stored in AH |
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| 99 | ; Corrupts registers: |
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| 100 | ; Nothing |
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| 101 | ;-------------------------------------------------------------------- |
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| 102 | Bios_ReadOldInt13hCapacityFromDriveDL: |
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| 103 | mov ah, GET_DISK_TYPE |
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| 104 | int BIOS_DISK_INTERRUPT_13h |
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| 105 | jc SHORT ReturnInvalidErrorCodeInAH |
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| 106 | xor ah, ah |
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| 107 | ret |
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| 108 | |
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| 109 | |
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| 110 | ;--------------------------------------------------------------------- |
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| 111 | ; Bios_ReadAtaInfoFromDriveDLtoBX |
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| 112 | ; Parameters: |
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| 113 | ; DL: BIOS drive number |
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| 114 | ; Returns: (if no errors) |
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| 115 | ; DS:BX: Ptr to ATA information |
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| 116 | ; AH: BIOS Error code |
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| 117 | ; CF: Cleared = no errors |
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| 118 | ; Set = BIOS error code stored in AH |
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| 119 | ; Corrupts registers: |
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| 120 | ; ES |
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| 121 | ;-------------------------------------------------------------------- |
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| 122 | Bios_ReadAtaInfoFromDriveDLtoBX: |
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| 123 | mov bx, g_rgbAtaInfo |
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| 124 | push ds |
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| 125 | pop es |
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| 126 | mov ah, GET_DRIVE_INFORMATION |
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| 127 | int BIOS_DISK_INTERRUPT_13h |
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| 128 | ret |
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| 129 | |
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| 130 | |
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| 131 | ;--------------------------------------------------------------------- |
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| 132 | ; Bios_ReadEbiosVersionFromDriveDL |
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| 133 | ; Parameters: |
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| 134 | ; DL: BIOS drive number |
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| 135 | ; Returns: |
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| 136 | ; AH: BIOS error code |
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| 137 | ; BX: Version of extensions |
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| 138 | ; CX: Interface support bit map |
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| 139 | ; CF: Cleared = no errors |
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| 140 | ; Set = BIOS error code stored in AH |
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| 141 | ; Corrupts registers: |
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| 142 | ; Nothing |
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| 143 | ;-------------------------------------------------------------------- |
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| 144 | Bios_ReadEbiosVersionFromDriveDL: |
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| 145 | mov ah, CHECK_EXTENSIONS_PRESENT |
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| 146 | mov bx, 55AAh |
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| 147 | int BIOS_DISK_INTERRUPT_13h |
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| 148 | jc SHORT .NoEbiosPresent |
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| 149 | cmp bx, 0AA55h |
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| 150 | jne SHORT .NoEbiosPresent |
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| 151 | eMOVZX bx, ah ; Copy version to BX |
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| 152 | xor ah, ah |
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| 153 | ret |
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| 154 | .NoEbiosPresent: |
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| 155 | mov ah, RET_HD_INVALID |
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| 156 | stc |
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| 157 | ret |
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| 158 | |
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| 159 | |
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| 160 | ;--------------------------------------------------------------------- |
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| 161 | ; Bios_ReadEbiosInfoFromDriveDLtoDSSI |
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| 162 | ; Parameters: |
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| 163 | ; DL: BIOS drive number |
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| 164 | ; Returns: (if no errors) |
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| 165 | ; DS:SI: Ptr to EDRIVE_INFO |
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| 166 | ; AH: BIOS Error code |
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| 167 | ; CF: Cleared = no errors |
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| 168 | ; Set = BIOS error code stored in AH |
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| 169 | ; Corrupts registers: |
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| 170 | ; Nothing |
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| 171 | ;-------------------------------------------------------------------- |
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| 172 | Bios_ReadEbiosInfoFromDriveDLtoDSSI: |
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| 173 | mov si, g_edriveInfo |
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| 174 | mov WORD [si+EDRIVE_INFO.wSize], MINIMUM_EDRIVEINFO_SIZE |
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| 175 | mov ah, GET_EXTENDED_DRIVE_INFORMATION |
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| 176 | int BIOS_DISK_INTERRUPT_13h |
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| 177 | ret |
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| 178 | |
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| 179 | |
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| 180 | ;--------------------------------------------------------------------- |
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| 181 | ; ReturnInvalidErrorCodeInAH |
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| 182 | ; ReturnWithBiosErrorCodeInAH |
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| 183 | ; Parameters: |
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| 184 | ; Nothing |
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| 185 | ; Returns: (if no errors) |
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| 186 | ; AH: BIOS Error code |
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| 187 | ; CF: Set |
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| 188 | ; Corrupts registers: |
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| 189 | ; Nothing |
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| 190 | ;-------------------------------------------------------------------- |
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| 191 | ReturnInvalidErrorCodeInAH: |
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| 192 | stc |
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[526] | 193 | mov ah, RET_HD_INVALID |
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[327] | 194 | ReturnWithBiosErrorCodeInAH: |
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| 195 | ret |
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| 196 | |
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| 197 | |
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| 198 | ; Section containing uninitialized data |
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| 199 | SECTION .bss |
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| 200 | |
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| 201 | g_edriveInfo: |
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| 202 | g_rgbAtaInfo: resb 512 |
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